You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: \ ((\\ ((practice guidebook) OR (practical guidebook)) to biostatistical AND epidemiology.\\ ) OR (\\ practice guide to statistical AND epidemiology.\\ ))*.

Perhaps you should try some spelling variations:
"\ \\ practice guidebook OR practical guidebook to biostatistical AND epidemiology.\\ OR \\ practice guide to statistical AND epidemiology.\\ *\" » "\ \\ practice guidebook OR practical guide to biostatistical AND epidemiology.\\ OR \\ practice guide to statistical AND epidemiology.\\ *\" (Expand Search), "\ \\ practical guidebook OR practical guidebook to biostatistical AND epidemiology.\\ OR \\ practical guide to statistical AND epidemiology.\\ *\" (Expand Search)